Probably would work, however I suspect the changes would not be as sticky.

Apple has some slightly more complex checks that they have used in the past to georestrict stuff like ECG, by using MCC/MNC codes from your mobile network. I suspect that the alt stores would be region locked and stop working outside the EU—but that remains to be tested, and seems like a fun thing to experiment with.

Don't see any reason why it wouldn't work. I suspect you don't even need a microwave in most places.